Printing telegraph apparatus



Dec. 27, 1932. E. E. KLEINSCHMIDT 1,892,352

PRINTING TELEGRAPH APPARATUS Filed June 27". 1931 FIG. 1 36' I a n. H

IN VEN TOR. fDW/IPO L. KZfl/VSCHM/DT A TTORNEY.

Fatented Est. 277, 1%32 ETEE) EDWARD E. KLEINSCHIVIIDT, OF HIGHLAND PARK, ILLINOIS, ASSIGNOR TO TELETYPE CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE Application filed June 27,

This invention relates to printing telegraph apparatus and more especially to selector mechanisms therefor.

Printing telegraph apparatus is being used today quite extensively for the dissemination of information; for example, stock quotations, where speed of transmission and reception is of material importance. The speed of transmission of electrical impulses is limited principally by the characteristic of the transmission circuits which have in the last few years been highly improved. and consequently the remaining factor is one of reception. High speed reception requires the rapid energization of an electro-magnet and the spontaneous control thereby of mechanical elements which must necessarily be light in weight to be capable'of movement upon the application of a small amount of energy.

It is the principal object of the present invention to provide a highly sensitive selector mechanism capable of operating at high speeds to'control effectively the setting of mechanical elements.

A further object is the provision of a materially simplified selector mechanism which embodies the characteristics necessary to high speed operation.

The above and other objects of the present invention are accomplished by the use of an electromagnetic structure wherein a controlling coil is mounted on and movable with the armature which need not be of magnetic material, and responds to the variations in the value or the reversal of current impressed on a line conductor in which the. controlling coil may be directly connected for either reversing the polarity of the armature or changing its magnetic properties. Specifizlly the selector magnet comprises a floating tontroller coil which encircles a cylindrical pole piece of a field magnet and is in turn surrounded by a cup vshaped pole piece of the opposite pole of the field magnet. By reason of the close proximity of the overlapping pole pieces to the floating coil thercbetween the latter member is spontaneously affected by the magnetic flux and requires but few turns or wire to be amply responsive. As a consequence of having to use but few turns PRINTING TE IEGRAPH APPARATUS 1931. Serial No. 547,198.

of wire and since it has no magnetic material to move against the normal lines of flux, the present device operates under conditions of minimum hysteretic. and eddy current losses. The arrangement also provides for a minimum and uniform air gap, thereby making it possible and practical to use mag ncto motive forces of smaller value for achieving the desired results.

more complete understanding of the invention may be had from the following description. taken in conjunction with the accompanying drawing wherein Fig. 1 is a perspective view of a preferred form of electro-magnctic structure illustrated in combination with a fragmentary showing of a selector mechanism of a printing telegraph receiver.

Fig. 9. is a plan View of a portion of the arrangement shown in Fig. 1 with parts broken away to disclose more clearly the structure involved.

Fig. 3 is a plan View of a modified form of the arrangement disclosed in Fig. 1.

Fig. 4 isa detail sectional view taken on the line 44 of Fig. 3.

Referring specifically to Fig. 1, there is disclosed a fragmentary portion of the selector mechanism used in one particular type of printing telegraph receiver which is disclosed in detail in U. Patent No. 1,821,- 110, issued, Sept. 1, 1931 to S. 'iorton al. Inasmuch as the selector mecln er se does not constitute a specific part L i. e present invention but is only illustrative of application and since the indicated structure is described fully in the referred to patent, only so much of the structure is disclosed as is necessary for a complete and full understanding of the present invention.

According to the disclosure of the aforementioned patent, the signals received from a distant station over a line conductor are impressed on an electro-magnet which responds Fi 1 the selector mechanism briefly delit) scrlbed consists of a flutter cam 11 which forms a part of and is rotated with a cam drum 12 on the periphery of'which is arranged a plu-rality of camfiprojections 13. These cam projections inthe course of their rotation with the cam drum 12 through a suitable drive connection, from a source of power (not shown), function to set successively selecting elements which settings are then transferred simultaneously to other elements for controlling the ultimate printing operations.

The settin of the cam drum 12 is controlled by a flutter lever 14 which is pivoted at 15 and which is provided with a bifurcated portion 16 having projections 17 which terminate in inward y disposed tips 18. The opposed tips 18 straddle the flutter cam 11 and are so spaced that upon the rotation of the cam drum 12 the latter may be reciprocate'd in accordance with the position of the flutter lever 14 and dependent upon the particular tip 18 which engages the radial flutes 19.

Extending from the pivot 15 and integral with the bifurcated portion 16 of the flutter lever 14 is an extension 21 which has its extremity formed into a shouldered portion 22 the movement of which, during the reciprocation of the flutterlever 14, describes an arouate path. A spring 23 secured to the framework of the supportin structure is connected to an arm 24 of the utter lever 14 and imparts a clockwise torque thereto as viewed in The actuation of the flutter lever 14. through the extension 21 is controlled by an electro-magnetic structure which consists of a field magnet 25 provided with pole pieces 26 and 27. The pole piece 26 is arranged with a cup shaped portion 28 whose aperature is suflicientlv large to receive a cylindrical stub pin 29 and to permit the free longitudinal movement therebetween of a controlling coil 31 with its supporting structure.

As is specifically disclosed in Figs. 1 and 2 the controllin coil 31 consists of a relatively few turns of %ne wire'wound on a form 32 which is secured to a ring portion 33 integral with the armature lever 34. The wire'terminals of the coil 31 are conveniently connected with the line conductor over which the impulses are transmitted for effecting the operation of the selector mechanism. The specific manner in which the ends of the controlling coil 31 are terminated is not shown. as it is conceivable that a variety of different methods might be adopted with equally good results. The armature lever 34 is pivoted at the terminals of its shaft rod 35, which are supported by set screw bearings 36 and is limited in its reciprocal movement by oppositely disposed stop screw 37.

The end of the armature lever 34 opposite the ring 33 is bent upwardly as viewed in Figs. 1 and 2 to provide a projection 38 which may upon the energization of the elec- By this arrangement, when a predetermined polarity of current is impressed on the controlling coil 31 or there is a variation in the value of the current applied thereto depending upon the mode of signalling that is used a corresponding reversal of the position of the armature 34 will occur and the projection 38 will be moved into or out of the path of the shoulder 22 depending upon the character of the energization of-the coil 31. \Vhen the projection 38 lies in the path of the shoulder 22 which is normally under the tension of spring 23 a blocking of the movement of the flutter lever 14 results and a corresponding reciprocal movementof the cam drum 12 through the flutter cam 11 will be produced. hen the coil 31 is moved in the opposite direction the projection 38 will not lie in the path of the shoulder 22 and therefore flutter ever 14 will be allowed to move under the influence of the spring 23 and cause no disturliance in the movement of the cam drum 12.

The movement of the armature 31 which as is clearly apparent from the structure disclosed moves only througha very small distance which is only that distance necessary to free or block the movement of the flutter lever 14. Vith this understanding it is apparent that the energy supplied to the electro-magnetic structure need not be large, but need only be large enough to move the projections 38 into or out of the flutter lever 14.

The magnetdisclosed in Fig. 1 is that of a polarized type and the armature 34 is adapted to remain in either of its two positions into which it may be moved. understood that where a neutral relay is preferred the armature will be merely biased by a spring to maintain it in a normal position while the controlling magnet will be of the neutral type.

In some cases and under certain conditions of operation it may be desirable to provide the field magnet with an electrical coil or winding 39 as indicated in dotted outline in Fig. 3. This construction may be preferred where greater power is required.

In the operation of the preferred embodiment of the present invention as disclosed in Figs. 1 and 2, a substantially constant magnetic flux is maintained by the field magnet 25 and the controlling coil 31 is connected in the signalling conductor or is associated therewith in a manner to be controlled by the signal impulses impressed thereon. By a reversal of the polarity-of the current impressed on the line or by changing the value of the current, a reversal of the magnetic flux path of the However, it will be of the arrow 41 as the flutter lever 14 isblocked by the armature projection 38 and consequently is not free to rotate. ,VVhen a spacing signal is received the lever 14 is accordingly not blocked but is free to rotate allowing the cam drum 12 to remain in its normal position.

In the modification illustrated in Figs. 3 and 4 the controlling coil 42 is of the rotating or galvanometer type instead of the type disclosed in Figs. 1 and 2. Pole pieces 43 and 44 comprise arcuate inclosure members that closely definethe'movement of the coil 42. A bridging piece 45 carries the magnetic flux of the field magnet and also closely defines the path "of the moving coil 42. g In this particularform of the invention the mass of the armature isfurther diminished from that disclosed in Figs. 1 and 2.

The structure of the present invention is particularly advantageous when it is desired to operate in series a large number of printing telegraph receivers. As has been noted, the controlling coil consists of a relatively small number of turns of wire and consequently the inductance of the coil is correspondingly small so as to permit the connection of alarge number of electro-magnets in a single circuit without materially interfering with the form of the signals and which makes it possible and practical to operate a large number of receiving printers involving such magnetic structures on one signal circuit.

While the present invention has been dis-v closed and described with reference to a particular form of apparatus it is obvious that various alternative forms and modifications may be made without departing from the spirit and scope of the present invention.

The invention claimed-is:

1. In a telegraph selector operable by alternative'line conditions, a selector mechanism capable of assuming two selective positions in accordance with said conditions, a relay armature adapted to determine said mechanism in either of its positions, a field magnet for said armature, and a winding secured to said armature and movable with it under control of saidline conditions for thereby causing the movement of said mech-.

anism.

2. In a telegraph selector, a storage setting cam adapted to assume two operating positionments, a source of power for operating said cam, an armature adapted to control the shifting of said cam into either of its operating positions, a field magnet, and a coil secured to said armature and movable with it relative to said magnet for thereby im arting movement to said armature for shi ing said cam in accordance with line conditions.

3. In a printing telegraph machine, a selector mechanism an electromagnetic selecting element responsive to electrical conditions for accordingly setting said mechanism comprising a field magnet, a floating coil disposed in the path of magnetic flux of said field magnet. and means under the control of said coil for effecting the selective action of said mechanism in accordance with electrical signals induced into said coil.

4. 'In combination with a telegraph selector having a signal storage setting element, a relay for controlling the mechanical operation of said selector comprising an armature lever for causing themovement of said element into one of alternative positions, a winding secured to said armature for movement therewith, a stationary field magnet. comprising overlapping pole pieces, one of said pole pieces defining a. socket member and the other of said pole pieces defining aplug member,

said pole pieces being spaced from each other to admit therebetween of the free longitudinal movement of said winding.

.In a telegraph selector, a blocking lever adapted by its interposition to determine correspondingly the action of said selector,'a.-

shifting lever for moving said mechanism into either of its positionments, a winding secured to said lever for movement with it, and a stationary field magnet for imparting movement to said shifting lever and winding in accordance with current impressions upon said winding.

7. In a start-stop telegraph device, a selector mechanism, a selector magnet comprising a field core having oppositely disposed poles, at non-magnetic armature pivotally supported at a point perpendicular to the lines of magnetic flux of said magnet, and a motor coil secured to said armature and disposed for movement in the path of magnetic flux in accordance with currents induced upon said coil for correspondingly conditioning said selector mechanism thereby.

8. In a telegraph selector mechanism, a reciprocating shifting lever, storage setting means shifted into various operative ositions by said lever, a pivoted blockin ever having one endthereof adapted to be a ternativeiy posiioned to control said shifting lever an electrical winding secured to the opposite end of said lever for movement theix wifli and a field magnet including an inner pole disposed Within said'winding and an outer pole encircling said Winding admin king of suiieient clearance for the movement of said Winding between said poles.

In testimony whereof I aiiix my signature.

7) EDWARD E. KLEINSCHMIDT. 

